CVE-2026-45771: high-severity vulnerability in signalwire freeswitch
Freeswitch Denial-of-Service in SIP PUBLISH Requests via XML Entity Expansion
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.3%
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.0, FreeSWITCH's bundled XML parser expands nested <!ENTITY> declarations without a depth or count bound, so a small DTD can describe a body that expands exponentially ("billion laughs"). The PIDF body of a SIP PUBLISH is fed to this parser before any digest check, letting an unauthenticated network attacker force unbounded CPU and memory consumption with a single request. This issue has been patched in version 1.11.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
signalwire · freeswitchRelated CVEs — signalwire freeswitch
In the same product, most dangerous first.
CVE-2026-116779CRITICALFreeSWITCH: Inbound SIP MESSAGE can select the api chat proto and run FreeSWITCH API commandsEPSS 1.3%KEVCVE-2021-37624HIGHFreeSWITCH does not authenticate SIP MESSAGE requests, leading to spam and message spoofingEPSS 3.8%CVE-2021-41105HIGHFreeSWITCH susceptible to Denial of Service via invalid SRTP packetsEPSS 2.5%CVE-2021-41157MEDIUMFreeSWITCH does not authenticate SIP SUBSCRIBE requests by defaultEPSS 1.7%CVE-2021-41145HIGHFreeSWITCH susceptible to Denial of Service via SIP floodingEPSS 1.7%CVE-2023-51443HIGHFreeSWITCH susceptible to Denial of Service via DTLS Hello packets during call initiationEPSS 1.5%